【題目】Birds' singing is sometimes a warning to other birds ______ away.
A.to stay
B.staying
C.stayed
D.stayed

【答案】A
【解析】句意：鳥(niǎo)叫有時(shí)是為了警告其他的鳥(niǎo)遠(yuǎn)離他們。空格置于句中，主謂與to do之間無(wú)逗號(hào)間隔，譯為“為了”選A。

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